Yes, that's because the installer uses "-f" on the the newfs_hammer command.
By doing this, they have disabled the feature that protects us from a
too small undo FIFO.
Gergo Szakal (via DragonFly issue tracker) wrote:
> Gergo Szakal <bastyaelvtars@gmail.com> added the comment:
>
> correction: I am also experiencing this on 2.4.1 and did so on 2.4.0. Has not
> happened before.
>
> _____________________________________________________
> DragonFly issue tracker <bugs@lists.dragonflybsd.org>
> <http://bugs.dragonflybsd.org/issue1083>
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>